Introduction

Every year, two million people visit the Great Barrier Reef to experience all that the massive marine National Park has to offer. But lately on Squiz Kids, we've heard that experts from the United Nations came to Australia to study the health of the reef and were recommending it be officially listed as in danger. We'll take you through what exactly is a coral reef and how one of Australia's top tourist attractions is in trouble. Listen carefully, there's a Squiz at the end.